Dispenser head with a check valve

ABSTRACT

One disadvantage during delivery of products such as foams, for instance shaving foam or gel, self-foaming products and other products that are applied with a pressurized system from a conventional, pressurized dispenser container with the aid of known dispenser heads that can be inserted into the delivery valve of the dispenser container is that the pressurized product remaining in the delivery channel continues to be pressed out in small amounts in an uncontrolled manner after utilization despite the fact that the delivery valve is closed. In order to eliminate said disadvantage, the dispenser head ( 1 ) is configured with an additional closing device ( 1 ′) that automatically opens the delivery hole ( 3 ) and automatically closes it after the dispensing process is completed.

The invention concerns a dispenser head with a delivery channel fordelivering products, such as foams, for example, shaving cream or gel,self-foaming products, and other products that can be applied with apressurized system, from a conventional pressurized dispensingcontainer, wherein the dispenser head is mounted on the delivery valveof the dispensing container and opens the delivery valve of thedispensing container when external mechanical pressure applied to thedispenser head causes its upper part to tilt about a center of rotation,so that the product flows under pressure out of the delivery valve andinto the delivery channel and is discharged from the dispenser headthrough the delivery hole of the delivery channel.

A disadvantage of previously known dispensers or dispenser heads of thistype is that after use and after the tilted upper part has returned toits initial position, the still pressurized product remaining in thedelivery channel continues to emerge in small amounts from the deliveryhole of the dispenser head, despite the fact that the delivery valve isalready closed. This undesired and uncontrolled continued release of theproduct then gets the dispenser head and, if present, the protective capdirty.

The objective of the invention is to design a dispenser head forpressurized dispensing containers in such a way that the above-describedcontinued release of the product after it use is prevented.

For a dispenser head of the type specified above, this objective isachieved by the characterizing features of claim 1 in such a way thatthe dispenser head is designed with an additional closure device thatautomatically opens the delivery hole of the delivery channel andautomatically closes it after the dispensing process is completed.

Release of the product after use is reliably prevented by the design ofthe dispenser head with a special closure for the delivery hole inaccordance with the invention. The closure device of the dispenser head,which can be fitted on any conventional aerosol valve, consists,specifically, of a valve housing, which forms part of the deliverychannel located in the upper part of the dispenser head, a pin-likevalve body with a valve head for closing the delivery hole, and arestoring element.

In a first embodiment of the invention, the restoring element consistsof an elastic dome, whose semicircular rear wall contains an innersleeve, into which the opposite end of the valve body from the valvehead is inserted. In the initial position, the internal stress of theelastic body pulls the valve head of the valve body against the deliveryhole of the delivery channel from the front and closes it.

The position of the elastic dome with respect to the usual center ofrotation for the tilting movement of the upper part of the dispenserhead is selected in such a way that, during the tilting movement, itselastic rear wall is moved in a circular path towards a stationary webof the lower part of the dispenser head, so that the elastic rear wallis deformed and displaced a certain distance in the direction of thedelivery hole.

The elasticity and the internal stress of the elastic dome that existsbefore the deformation are set sufficiently great by suitable selectionof a material that after the upper part has been returned to its initialposition, the rear wall of the dome returns to its initial position andthus pulls the valve head of the valve body back onto the delivery holeof the delivery channel from the front. This process is assisted by thepressurized process remaining in the valve housing, which pressesagainst both the valve head and the rear wall of the dome. Since,however, in accordance with the invention, the effective surface of therear wall is greater than the effective surface of the valve head, theresultant force exerted by the pressurized product acts to restore therear wall and thus to close the delivery hole.

In a second embodiment of the invention, the valve body, whose valvehead closes the delivery hole from the front, is locked in place in avalve body sleeve. The rear part of the valve body sleeve consists of anelastic jacketed wall that acts as a restoring element and ispermanently connected with the upper part and/or the lower part of thedispenser head. This elastic rear part of the jacketed wall has the samefunction as the elastic dome of the first embodiment. During the tiltingmovement of the dispenser head, the elastic rear part of the jacketedwall moves in a circular path towards a stationary web of the lowerpart, which causes it to be deformed and displaced, together with thevalve body, towards the delivery hole. This causes the valve head, whichuntil now has kept the delivery hole closed, to move towards the outsideand open the delivery hole. After the tilted upper part has returned toits initial position, thereby causing the rear part of the valve bodysleeve to come clear of the stationary web again, the restoring force ofthe elastic part of the valve body sleeve acts to pull the valve bodyback into its initial position to close the delivery hole again.

In a third embodiment of the invention, the rear part of the valve body,which closes the delivery hole from the inside, is designed as ajacketed wall and can be filled with the product that is to bedelivered. The outer wall of the valve body is made of an elasticmaterial and acts as a restoring element. To this end, the front part ofthe elastic valve body wall is permanently connected with the upper partand/or the lower part of the dispenser head. This permanent connectionis designed in such a way that the elastic valve body wall is placedunder tensile stress in the initial position, so that the conical orround tip of the valve head is pulled from the inside against thecorrespondingly shaped nozzle orifice of the delivery hole and seals ittightly. During the dispensing operation, the product that is to bedelivered flows under pressure into the jacketed wall of the valve body.The pressure thus exerted on the inner rear wall of the jacketed wall isgreater than the tensile stress in the elastic region of the valve bodywall, so that the valve body is pulled inward and opens the deliveryhole towards the inside. The tensile stress already present in theinitial position is thus increased, accompanied by expansion of theelastic region of the valve body wall. Upon completion of the dispensingprocess, the stress present in the elastic valve body wall is sufficientfor automatic restoration of the valve body and renewed closure of thedelivery hole.

The elastic part of the valve body sleeve (second embodiment) or of thevalve body wall (third embodiment) is joined with the other, nonelasticpart of the valve body sleeve or valve body wall in one-piecefabrication by injecting it on by a special injection molding process(two-component injection molding). In this regard, the internal stressof these elastic restoring elements is selected sufficiently high by theuse of a suitable elastic material, for example, TPE (thermoplasticelastomers), that it is able, after completion of the dispensingoperation and after the return of the tilted upper part of the dispenserhead to its initial position, to pull the valve body back into itsinitial position and to close the delivery hole tightly again with thevalve head.

In a fourth embodiment, which is similar to the third embodiment, thevalve body is designed with a jacketed wall, which can be filled withthe product that is to be delivered. To lock the valve body in place,the double-walled rear part of the valve body is pressed against aprojecting rib of a stationary web in the initial position of thedispenser head, and the valve head fits against the delivery hole andtightly seals it from the inside. In this initial position, the rearelastic region of the jacketed wall is compressed. The web and its ribare arranged in such a way that the valve body is rotated out of itslocked position by the circular tilting movement of the upper part ofthe dispenser head during the dispensing process. After the valve bodyhas been released from its locked position, the excess pressure of theproduct that prevails in the jacketed wall, which initially acts only onthe rear wall of the jacketed wall, pulls the valve body inward,assisted by the restoring force of the compressed elastic region of thejacketed wall, thereby causing the valve head to open the delivery hole.When the upper part of the dispenser head rotates back into its initialposition, the valve body is manually rotated back towards the deliveryhole by the projecting rib. This causes the delivery hole to be closedand the elastic region of the jacketed wall of the valve body to becompressed again.

Further advantages, features and details of the invention are explainedin greater detail below with reference to specific embodimentsillustrated in the schematic drawings.

FIG. 1 shows a vertical section through a dispenser head in its initialposition.

FIG. 2 shows a vertical section through a dispenser head in itsdispensing position.

FIG. 3 shows a front view of the dispenser head of FIG. 1.

FIG. 4 shows the dispenser head of FIG. 1 without the closure device.

FIG. 5 shows the closure device of FIGS. 1, 2, and 3.

FIG. 6 shows the valve body of FIG. 5.

FIG. 7 shows the valve housing of FIG. 5.

FIG. 8 shows the elastic dome of FIG. 5.

FIG. 9 shows a vertical section through a second dispenser head in itsinitial position.

FIG. 10 shows an enlarged section of FIG. 9 in its dispensing position.

FIGS. 11 a,b show two alternative designs of the delivery hole closureof the second dispenser head.

FIG. 12 shows a vertical section through a third dispenser head in itsinitial position.

FIG. 13 shows an enlarged section of FIG. 12 in its dispensing position.

FIGS. 14 a-c show three alternative designs of the delivery hole closureof the third dispenser head.

FIGS. 15 a,b show a vertical section through a fourth dispenser head inits initial position and dispensing position, respectively.

FIG. 1 shows a vertical section through a dispenser head 1 with aclosure device 1′ and with the dispenser head in its initial position.This closure device 1′ is located in the upper part 10 of the dispenserhead 1. The upper part 10 of the dispenser head 1 can be tilted relativeto the opening of the delivery valve of the dispensing container. Theclosure device 1′ consists of a valve housing 4, which at the same timeis part of the upper (in the drawing, horizontal) delivery channel 2 andis arranged at right angles to the container axis 15, a pin-like valvebody 5 with a valve head 7, and an elastic restoring element or dome 6(in this regard, see also FIGS. 5 to 8).

The front part of the valve housing 4 ends some distance from the frontedge 16 of the upper delivery channel 2 with the delivery hole 3, andthe rear part of the valve housing 4 (on the right side in the drawing)is formed by the elastic dome 6 that is slipped over it. Thesemicircular rear wall 12 of the dome 6 has a sleeve 8, into which thetapered end 18 of the pin-like valve body 5 at the opposite end of thevalve body 5 from the valve head 7 is inserted. The length of thepin-like valve body 5 is dimensioned in such a way that, in the initialposition of the dispenser head 1, the valve head 7 is pulled from thefront against the delivery hole 3 by the internal stress of the elasticdome 6 and closes the delivery hole 3.

The lower part 11 of the dispenser head 1, which is not tiltable and isconnected with the dispensing container (the dispensing container is notshown) by being mounted on it, has a lateral web 9, which is tangent tothe semicircular rear wall 12 of the dome 6.

FIG. 2 shows the dispenser head 1 of FIG. 1 in its dispensing position.The upper part 10 of the dispenser head 1 has been tilted about a centerof rotation (the center of rotation is not shown) by external mechanicalpressure on the button 17 of the dispenser head, thereby causing thedelivery valve (not shown) of the dispensing container to open and theproduct to flow into the delivery channel 2 and into the valve housing4. During this tilting movement, the dome 6 was moved downward towardsthe dispensing container in a circular path with its semicircular rearwall 12 against the stationary web 9, which caused the rear wall 12 todeform and to be displaced in the direction of the delivery hole. Thisdisplacement of the rear wall 12 also caused the valve body 5, which isinserted in the sleeve 8 on the inside of the rear wall 12, to bedisplaced, together with its valve head 7, in the same direction,thereby opening the delivery hole 3. In this dispensing position, theproduct already present in the valve housing 4 can be discharged fromthe delivery hole 3.

When the dispensing process has been completed and the externalmechanical pressure on the button 17 has been discontinued, the closuredevice 1′ is rotated back with the upper part 10 of the dispenser head 1to its initial position by the tension present in the center of rotationof the dispenser head 1 and by the force of the still open deliveryvalve of the dispensing container, so that the delivery valve of thedispensing container closes again. The restoration of the upper part 10causes the rear wall 12 of the elastic dome 6 to clear the web 9 again,and its deformation is eliminated by its internal stress and the excesspressure of the product still present in the valve housing 4. The valvebody 5 attached to the rear wall 12 is thus pulled in the same directionback into its original position, and the valve head 7 is pulled tightlyagainst the delivery hole 3 from the front, so that the delivery hole 3is closed.

Another advantage of the closure device 1′ of the invention is that thepressing of the valve head 7 against the delivery hole 3 is effected notonly by the internal stress of the elastic dome 6 abut also by thedifference in size of the effective surfaces 13, 14 of the rear wall 12and valve head 7 that are acted upon by the excess pressure of theproduct. Since the effective surface 14 of the rear wall 12 of the dome6 is significantly greater than the effective surface 13 of the valvehead 7, a resultant force is created, which acts only on the rear wall12, with the result that the greater the overpressure is, the greateralso is the force with which the valve head 7 is pulled against thedelivery hole 3 and the greater also is the tightness of the system. Thestated objective of the invention of preventing continued release of theproduct after the dispensing process has been completed is thusachieved.

In FIGS. 3 to 8, the essential design elements of the dispenser head ofthe invention 1 are shown again individually for better clarity. In FIG.3, the dispenser head 1 of FIG. 1 with the closure device 1′ of theinvention is shown in a front view. A comparison with FIG. 4, whichshows the dispenser head 1 without the closure device 1′, more clearlyreveals especially the size of the closure device 1′ in relation to thesize of the dispenser head 1 and its adaptation to the dispenser head.FIG. 5 shows the complete closure device 1′ separately in its initialposition with the delivery hole 3 closed and the rear wall 12 of thedome 6 undeformed. In FIGS. 6 to 8, the individual components of thisclosure device 1′ are then presented separately. FIG. 6 shows the valvebody 5 with the valve head 7 at one end and the tapered opposite end 18for insertion in the sleeve 8 of the dome 6. FIG. 7 shows the valve body4, and FIG. 8 shows the elastic dome 6 with its rear wall 12 and thesleeve 8 arranged on it.

FIGS. 9 and 10 show a second embodiment of the dispenser head of theinvention. FIG. 9 shows the entire dispenser head 20 in its initialposition, and FIG. 10 shows an enlarged section of the dispenser head 20in its dispensing position. The dispenser head 20 consists of an upperpart 30 and a lower part 31 with an integrated closure device 21. Avalve body sleeve 28 with a valve body 25 inserted from the front andlocked in place is arranged in the valve housing 24 of the closuredevice 21. To guide the valve body 25, the front part of the valve bodysleeve 28 is formed with a nozzle head 36 with alternately arrangedpassages 36′ in a guide region 34 to allow the delivery of the productbetween the valve body 25 and the valve body sleeve 28. The valve body25 is arranged in the valve body sleeve 28 in such a way that the valvehead 27 closes the delivery hole 23 from the front. The valve bodysleeve 28 is formed as part of the delivery channel 22 with a jacketedwall 32, which can be filled with the product through the lower opening33.

A seal is created between the dispenser head 20 and the closure device21 by two elastic annular beads 32′ and 32″. Between these two annularbeads 32′ and 32″, an annular space is formed, through which the productcan flow, so that positioning of the lower opening 33 of the closuredevice relative to the product channel 19 of the dispenser head 20becomes unnecessary. The result of this measure is easier assembly.

The function of the elastic dome 6 as a restoring element in the firstembodiment of the invention, which is illustrated in FIGS. 1 to 8, isperformed in this second dispenser head 20 by the injected rear end 26of the valve body sleeve 28. This rear end 26 consists of an elasticmaterial and is permanently connected in a snap-in connection by theelastic annular beads 32′, 32″ with the upper part 30 and the lower part31 of the dispenser head 20.

During the tilting movement of the closure device 21 by manual pressureon the button 37 to initiate the dispensing process, the valve bodysleeve 28 with its restoring element or rear end 26 is moved in acircular path towards the stationary web 29 of the lower part 31 andpushed towards the front along with the valve body 25, so that the valvehead 27 opens the delivery hole 23 towards the front, and the productemerges from the valve head 27 in the direction 39 indicated by thearrow. At the same time, the contact with the web 29 deforms(compresses) the elastic rear end 26. Upon completion of the dispensingprocess, the rear end 26 of the valve body sleeve 28 comes clear of theweb 29 again, and the restoring force of the compressed rear end 26 andthe pressure exerted on its rear wall 26′ by the still pressurizedproduct present in the jacketed wall 32 pull the valve body sleeve 28together with the valve body 25 back into the initial position. Thenozzle head 36 of the delivery hole 23 is designed with a corner thatsprings back and in this initial position is sealed with point contactby the valve head 27 with its conically formed front part.

FIGS. 11 a and 11 b show alternative designs of the delivery holeclosure with nozzle head 36 and valve head 27. In FIG. 11 a, with adesign that is similar overall to the design shown in FIGS. 9 and 10,the nozzle head 36 a is likewise formed with a cone that corresponds tothe cone of the valve head 27 a of the valve body 25 a, so that asealing contact of large surface area is produced. In FIG. 11 b, withthe same conical seal between the valve head 27 b and the nozzle head 36b and a smaller guide region of the nozzle head 36 b, the valve head 27b of the valve body 25 b is additionally designed with an outwardlyprojecting central pin 35, which ensures better distribution of theproduct as it is delivered from the dispenser head.

A third variant of the dispenser head of the invention is shown in itsinitial position in FIG. 12 and in its dispensing position in FIG. 13,which shows an enlarged section of FIG. 12. The dispenser head 40consists of an upper part 50 with a closure device 41 installed in itand a lower part 51. The closure device 41 consists of a valve housing44 with a nozzle head 56 and a valve body 45, whose valve head 47 closesthe delivery hole 43 of the nozzle head 56 from the inside. The rearpart of the valve body 45 is formed by a jacketed wall 52, which is opentowards the valve head 47 and in the opposite direction is closed by arear wall 52′. The jacketed wall 52 thus forms part of the deliverychannel 42 and can be filled with the product to be delivered through alower opening 53. The outer valve body wall 46 acts as a restoringelement and consists of an elastic material injected on the other wall.It is permanently connected with the upper part 50 and the lower part 51in a snap-in connection by means of the elastic annular beads 46′, 46″.These annular beads 46′, 46″ result, in the same way as in FIG. 10, in aseal between the dispenser head 40 and the closure device and, in thesame way as described there, result in easier assembly by the formationof an annular space through which product can flow.

In the initial position, the elastic valve body wall 46 is under tensilestress as a restoring element and pulls the valve body 45 with its valvehead 47 against the delivery hole 43 of the nozzle head 56 to seal it.This tensile stress in the elastic valve body wall 46 is produced byvirtue of the fact that the nozzle head 56 is installed by inserting itfrom the front into the valve housing 44, thereby displacing the valvebody 45 to the rear.

The elastic valve body wall 46 acts as an automatic restoring elementduring the dispensing process in the following way: During thedispensing process, operation of the button 57 causes the product thatis to be delivered to flow from below through the lower opening 53 intothe cavity formed by the jacketed wall 52. The pressurized product,whose pressure is greater than the preset tensile force, presses againstthe rear wall 52′ of the jacketed wall and, since the delivery hole 43is still closed at first, causes expansion of the elastic outer valvebody wall 46 and an increase in the tensile stress that was initiallypresent, thereby displacing the valve body 45 in the direction of therear wall 52′. This displacement causes the valve head 47 of the valvebody 45 to open the delivery hole 43 towards the inside, and the productcan then emerge from the dispenser head 40 in the direction 59 indicatedby the arrow. Upon completion of the dispensing process, the restoringforce of the elastic outer valve body wall 46 automatically pulls thevalve body 45 back into its initial position, and the valve head 47closes the delivery hole 43. The conically pointed valve head 47, whichis adapted to the conical shape of the delivery hole 43 of the nozzlehead 56, ensures the closing of the delivery hole 43.

Further possible designs of the front closure are shown in FIGS. 14 a to14 c. In FIG. 14 a, the front part of the valve body 47 a is designedwith a central cylindrical pin 55. The valve body 45 a is guided here byguide webs 58 a, which are arranged in the delivery opening 43 a of thenozzle head 56 a with conical centering and encompass the cylindricalpin 55. The delivery hole 43 a is sealed by a flat seal between theperipheral edge 48 of the valve head 47 a and the rear part of thenozzle head 56 a. In FIG. 14 b, which shows a design that is otherwiseidentical to the design of FIG. 14 a, the delivery hole 43 a is sealedbetween the rear part of the nozzle head 56 b, which is designed flat inthe radial direction, and the peripheral edge 48 of the end face of thevalve head 47 b. FIG. 14 c shows another variant with the same seal asin FIG. 14 a or 14 b, but in this case the guiding of the valve body 45c is augmented in such a way that, in addition to the guiding of the pin55, an extended front part 45 c′ of the valve body 45 c is guided andsupported by the correspondingly formed nozzle head 56 c′.

Another (fourth) design variant of the dispenser head is shown in FIGS.15 a (in the initial position) and 15 b (in the dispensing position).Just like the dispenser head 40 of FIG. 12, the dispenser head 60consists of an upper part 70 and a lower part 71 and has a closuredevice 61. The closure device 61 has a valve housing 64 that contains avalve body 65 with an elastically designed jacketed wall 72 in its rearregion 66 as a restoring element. The jacketed wall 72, which is opentowards the valve head 67 and closed in the opposite direction, can befilled through a lower opening 73 with the product that is to bedelivered and forms part of the delivery channel 62.

In the initial position of the dispenser head 60, the valve body 65 ismanually supported with its rear end 72′ against a projecting rib 69′ ofa stationary web 69 of the lower part 71 and locked in place, and thevalve head 67 is pressed from inside against the delivery hole 63, andat the same time, the elastically designed region 66 is compressed. Theweb 69 with its projecting rib 69′ is arranged in such a way that, whenthe button 77 is manually operated during the dispensing operation, thevalve body 65 is rotated out of this locked position by the circulartilting movement of the upper part 70. The valve body 65, which comesfree at the rear, is pulled in the direction of the web 69, (towards theright in the drawing) by the pressure exerted by the product on the rearwall of the jacketed wall 72 and by the elastic resilience of thecompressed region 66, and this allows the product to emerge from thedispenser head 60 in the direction 79 indicated by the arrow.

Upon completion of the dispensing process, the delivery opening 63 isclosed again by the valve head 67 when the upper part 70 rotates back.This rotation causes the rear end 72′ of the valve body 65 to be pushedupward over the oblique shoulder 74 of the rib 69′ and at the same timeforward (towards the left in the drawing), so that the valve head 67 ispressed against the delivery hole 63 from the inside. At the same time,the elastic region 66 of the jacketed wall 72 is compressed again. Therestoring force of the upper part to reestablish the initial position issufficiently great to be able to pull the end 72′ of the valve body 65over the oblique shoulder 74 of the rib 69′. In the same way as in FIG.10 and FIG. 13, annular beads 66′, 66″ are arranged in the elasticregion 66 of the jacketed wall 72, which in the identical way describedin connection with FIG. 10 and FIG. 13, produce a seal between thedispenser head 60 and the closure device 61 and result in easierassembly.

The invention is not limited to the specific embodiments that aredescribed above and are illustrated in the drawings, but rather anequivalent or functionally equivalent closure device in accordance withthe invention can also be used in other commercial dispenser heads forpressurized dispensing containers after a possibly necessary designadaptation.

List of Reference Numbers

-   1, 20, 40, 60 dispenser head-   1′, 21, 41, 61 closure device-   2, 22, 42, 62 delivery channel-   3, 23, 43, 63 delivery hole-   4, 24, 44, 64 valve housing-   5, 25, 45, 65 valve body (also 25 a, 25 b, 45 a, 45 b, 45 c)-   6, 26, 46, 66 restoring element-   7, 27, 47, 67 valve head (also 27 a, 27 b, 47 a, 47 b, 47 c)-   8, 28 sleeve-   9, 29, 69, 69′ web-   10, 30, 50, 70 upper part of 1′, 21, 41, 61-   11, 31, 51, 71 lower part of 1′, 21, 41, 61-   12 rear wall of 6-   13 effective surface of 12-   14 effective surface of 7-   15 axis of dispensing container-   16 front edge of 2-   17, 37, 57, 77 button-   18 tapered end of 5-   19 product channel-   26′, 52′ rear wall of 26, 52-   32, 52, 72 jacketed wall of 25, 45, 65-   32′, 32″, 46′, 46″ annular beads of 26, 46, 66 (also 66′, 66″)-   33, 53, 73 lower opening-   34 guide region of 25-   35, 55 central spindle of 25 b, 45-   36, 56 nozzle head (also 36 a, 36 b, 56 a, 56 b, 56 c)-   36′ passages-   28 snap-in connection-   39, 59, 70 direction of product delivery-   48 peripheral edge-   58 a-c guide webs-   74 oblique shoulder

1. Dispenser head (1, 20, 40, 60) with a delivery channel (2, 22, 42,62) for delivering products, such as foams, for example, shaving creamor gel, self-foaming products, and other products that can be appliedwith a pressurized system, from a conventional pressurized dispensingcontainer, wherein the dispenser head is mounted on the delivery valveof the dispensing container and opens the delivery valve of thedispensing container when external mechanical pressure applied to thedispenser head causes its upper part (10, 30, 50, 70) to tilt about acenter of rotation, so that the product flows under pressure out of thedelivery valve and into the delivery channel (2, 22, 42, 62) and isdischarged from the dispenser head (1, 20, 40, 60) through the deliveryhole (3, 23, 43, 63) of the delivery channel, wherein the dispenser head(1, 20, 40, 60) is designed with an additional closure device (1′, 21,41, 61) that automatically opens the delivery hole (3, 23, 43, 63) ofthe delivery channel (2, 22, 42, 62) and automatically closes it againafter the dispensing process is completed.
 2. Dispenser head (1, 20, 40,60) in accordance with claim 1, wherein the closure device (1′, 21, 41,61) consists of a valve housing (4, 24, 44, 64), which forms part of thedelivery channel (2, 22, 42, 62), a pin-like valve body (5, 25, 45, 65)with a valve head (7, 27, 47, 67) for closing the delivery hole (3, 23,43, 63), and a restoring element (6, 26, 46, 66).
 3. Dispenser head (1)in accordance with claim 2, wherein the restoring element is an elasticdome (6) whose end is formed as a semicircular rear wall (12), on theinner surface of which the opposite end of the valve body (5) from thevalve head (7) is fastened, such that, in the initial position, thevalve head (7) closes the delivery hole (3) from the front.
 4. Dispenserhead (1) in accordance with claim 3, wherein the effective surface ofthe valve head (7) that comes into contact with the product to bedelivered is smaller than the inner effective surface of the rear wall(12) of the elastic dome (6).
 5. Dispenser head (20) in accordance withclaim 2, wherein the valve body (25), whose valve head (27) closes thedelivery hole (23) from the front, is locked in place in a valve bodysleeve (28), and the rear part (26) of the valve body sleeve (28) isdesigned as a restoring element made of an elastic material, which ispermanently connected with the upper part (30) and/or the lower part(31) of the dispenser head (20).
 6. Dispenser head (1, 20) in accordancewith claim 3, wherein the closure device (1′ 21) is arranged in such away with respect to the center of rotation of the dispenser head (1, 20)that the elastic rear end of the restoring element (6, 26) is moved in acircular path during the tilting movement of the upper part (10, 30) ofthe dispenser head (1, 20).
 7. Dispenser head (1, 20) in accordance withclaim 6, wherein a stationary web (9, 29) is arranged on the lower part(11, 31) of the dispenser head (1, 20) in such a way that when the upperpart (10, 30) is tilted, the elastic rear end of the restoring element(6, 26) is moved towards the web (9, 29) during its circular movement,which causes it to be deformed and displaced, along with the valve body(5, 25), in the direction of the delivery hole (3, 23), so that thevalve head (7, 27) opens the delivery hole (3, 23) of the deliverychannel (2, 22) towards the outside.
 8. Dispenser head (40, 60) inaccordance with claim 1, wherein the rear part of the valve body (45,65) consists of a jacketed wall that acts as a restoring element and isdesigned with an elastic outer valve body wall (46, 66) and can befilled with the product that is to be delivered, such that the frontpart of the elastic valve body wall (46, 66) is permanently connected bymeans of annular beads (46′, 46″, 66′, 66″) with the upper part (50, 70)and/or with the lower part (51, 71) of the dispenser head (40, 60), andsuch that the valve head (47, 67) closes the delivery hole (43, 63) fromthe inside.
 9. Dispenser head (1, 20, 40) in accordance with claim 3,wherein the internal stress of the elastic restoring element (6, 26, 46)is selected sufficiently high that, after the dispensing process hasbeen completed and the upper part (10, 30, 50) has returned to itsinitial position, it assists the driving forces by the product pressurethat is still present to pull the valve body (5, 25, 45) back into itsinitial position and to close the delivery hole (3, 23, 43) again withthe valve head (7, 27, 47).
 10. Dispenser head (20, 40, 60) inaccordance with claim 5, wherein the elastic part (26) of the valve bodysleeve (28) or the elastic part (46, 66) of the valve body (45, 65) isjoined with the other, nonelastic part of the valve body sleeve (28) orvalve body (45, 65) in one-piece fabrication by injecting it on by aspecial injection molding process (two-component injection molding). 11.Dispenser head (60) in accordance with claim 1, wherein the valve body(65) is designed with a jacketed wall (72) that can be filled with theproduct that is to be delivered, and, in the initial position, aprojecting rib (69′) of a stationary web (69) of the lower part (61)acts at the rear end (72′) of the valve body (65) to lock it in placeand presses the valve head (67) of the valve body (65) from insideagainst the delivery hole (63) and, at the same time, compresses theelastic rear region (66) of the jacketed wall (72), wherein the web (69)and its rib (691) are designed in such a way that the circular tiltingmovement of the upper part (70) rotates the valve body (65) out of itslocked position, and that, after this locking mechanism has beenreleased, the product pressure acting in the jacketed wall (72) and therestoring force of the compressed region (66) displace the valve body(65) to open the delivery hole (63).
 12. Dispenser head (1, 20, 40, 60)in accordance with claim 3, wherein the elasticity of the elasticrestoring element (6, 26, 46, 66) is selected sufficiently high by theuse of a suitable elastic material, for example, TPE, that it allowslimited relative movement between the valve head (7, 27, 47, 67) and thedelivery hole (3, 23, 43, 63).